Dometic - RV Refrigerator Repair

1 Dometic Dometic AES Refrigerator . DIAGNOSTIC SERVICE. MANUAL. The Dometic Corporation Corporate Office 2320 Industrial Parkway Elkhart, In. 46515. 219-295-5228. Warranty 205 E. Fenn St. Department LaGrange, In. 46761. 219-463-2191. Technical Services 509 S. Poplar St. Department LaGrange, In. 46761. 219-463-4858. OS1160A 11/88 A-l Diagnostic Service Manuals TABLE OF CONTENTS. Diagnostic Flow Charts No Operation .. * . A-5- 1. No 120V AC Operation .. A-5-2. No 12V DC Operation .. A-5-3. No Gas Operation.. A-5-4. Operation and Diagnosis Dometic AES Refrigerators .. A-6- 1. Glossary of Terms .. A-7- 1. Continuity Readings for Switch Card and Harness .. A-8- 1. Service Bulletins.. A-9- 1. AES Refrigerator Manual Subscription Form .. A-14. A-3. AES Refrigerator . DIAGNOSTIC FLOW CHART. NO OPERATION. A.

2 Check supply voltage. Correct coach wiring as necessary. 1. Polarity (see pgs. A-6-23. 2. Battery supply to A-6-30. 3. Wire size para. 7 9 - 8 4 ). OK. B. Replace fuse as Check fuse. necessary (see pg. A-6-34, NOT OK para. 9 6 ). OK. Replace thermostat as necessary Check thermostat. (see pgs. A-6-34. t t o A - 6 - 3 5 , para. N. OTO. K 97- 100). OK. Replace switch as Check necessary (see pgs. A-6-35. t o A - 6 - 3 6 , para. 100-103; & pgs. A-8-l to A-8-5). OK. Replace solenoid as Check solenoid. necessary (see pg. A-6-36, para. 104-106). A-5-1. AES Refrigerator . DIAGNOSTIC FLOW CHART. NO 120V AC Operation A. Check supply voltage. Correct coach wiring 1. Polarity 2. Battery supply t o A - 6 - 3 0 , para. 3. Wire size NOT. OK 79-84). Correct coach wiring and/or power source Check AC voltage (breakers) as necessary NOT (see pgs.

3 A-6-22 to OK A - 6 - 2 3 , para. 75-78). OK. C. Replace heating element Check AC heating element w/correct size &. for proper resistance; wattage as necessary Insure proper size ( s e e pgs. A-6-38 to and wattage A - 6 - 3 9 , para. N. O. OT. K. 111-116). OK. D. Replace switch as necessary (see pgs. A-6-35 to Check switch A - 6 - 3 6 , para. NOT 101-103 & pgs. OK A-8-l to A-8-5). OK. E. Replace solenoid as Check solenoid necessary (see pg. A-6-36, para. 104- 106). OK. F. Correct as necessary Check AC leads on (see p g . A - 6 - 3 9 , printed circuit board NOT para. 117). OK. A-5-2. AES Refrigerator . DIAGNOSTIC FLOW CHART. NO 12 VOLT DC OPERATION. A. Check supply voltage 1. Polarity Correct coach wiring as necessary 2. Battery supply - (see pgs. A-6-23 to A-6-30, 3. Wire size NOT para. 7 9 - 8 4 ).

4 OK. OK. B. Check that Refrigerator Correct wiring as necessary is wired directly to (see pgs. A-6-27 & A - 6 - 2 9 ). 12V battery NOT. OK. OK. c. Check for proper gauge Rewire w/proper gauge wire as wire in 12V installation necessary (see chart on pg. A-6-26). NOT. OK OK. D. I 1. Check ignition lock Repair circuit as necessary terminal for 12V when (see p g . A - 6 - 4 0 , ignition key is placed para. 120). in the ON position only NOT. E. Replace relay as necessary Check DC relay (see pgs. A-6-41 to A - 6 - 4 2 , para. 123-l 27). NOT. OK. F. Replace element as necessary Check 12V DC element (see pgs. A-6-42 to A - 6 - 4 3 , para. 128-l 29). NOT , OK. G. Replace switch as necessary ( s e e p g s . A - 6 - 3 5 t o A - 6 - 3 6 , para. Check switch 101-103 8c pgs. A-8-l to NOT A-8-5). OK OK. H. Correct connections and/or replace printed circuit Check printed circuit board as necessary (see pgs.)

5 board & connections t A-11-3 to A-11-5). NOTOK. A-5-3. AES Refrigerator . DIAGNOSTIC FLOW CHART. NO GAS OPERATION. Check supply voltage 1. Correct coach wiring as 1. Polarity necessary (see pgs. A-6-23. 2. Battery Not t o A - 6 - 3 0 , para. 3. Wire size OK 79-84). t - i OK. B. 1. Check that 120V AC Disconnect supply line is not present (see p g . A - 6 - 4 4 , at receptacle para. 1 3 4 ). OK. C. Check that 12V i s not Repair circuit as present at tag line necessary (see pg. A-6-44, para. 1 3 4 ). I. OK. D. Adjust coach regulator Check gas pressure as necessary (see pgs. NOT A-6-44 to A-6-45, OK para. 1 3 5 - l 3 6 ). OK. E. Clean flue, clean or replace burner and orifice as necessary ( s e e p g . A - 6 - 4 8 , para. 148- 149). OK. (continued on page A-5-5). A-5-4. AES Refrigerator . DIAGNOSTIC FLOW CHART.

6 NO GAS OPERATION (continued). OK. G. Replace solenoid as Check solenoid necessary (see pgs. NOT A-6-45 to A-6-46, OK para. 1 3 7 - l 4 0 ). OK. H. , Replace parts as Check electrode and necessary and/or electrode wire (See pg. A-6-47, NOT. OK para. 145- 1 4 6 ). A-5-5. OPERATION AND DIAGNOSIS. Dometic AES REFRIGERATORS. A-6- 1. (1). Welcome to the Dometic Refrigerator training program. In this program we will discuss the features, operating sequences and diagnostic procedures for the Dometic refrigerators that are equipped with the Automatic Energy Selector Control system; for short. (2). With this type of control system the customer no longer has to manually switch the Refrigerator to the desired mode of operation. All that is left for the customer to do is to turn the Refrigerator ON and to select the desired temperature range by way of the thermostat knob.

7 The Refrigerator will automatically select between 120V AC, 12V DC or LP gas to operate the Refrigerator . (3). The selection will be made electronically with the highest priority going to the 12OV AC. cooling mode; second priority going to the 12V. DC heating element, providing the motor home's ignition key is turned ON and the vehicle is in motion. Last priority is LP gas operation. (4). Since the introduction of the first refrigerators in 1983 there have been three distinct model series or generations available. We will discuss each of the three model gener- ations separately to illustrate the parts location and operational differences between each model series. A-6-2. (5). Shown here is the RM1303 that is one of the models that make up the first generation refrigerators. The models in this series include from the smallest size to the largest size: the RM663 which is a 5 cubic foot Refrigerator , the RM763 which is a 6 cubic foot Refrigerator and lastly, the RM1303 which is an 8 cubic foot Refrigerator .

8 (6). Let's now take a closer look at the parts location and operation of these models. From the lower front of the Refrigerator we can see the main control panel assembly. This assembly contains the two control knobs and the lamp that will illuminate when the Refrigerator is turned on. (7). The knob on the right is the main switch that is used to turn on the Refrigerator and the knob to the left is the thermostat control that is u s e d t o r e g u l a t e t h e l o w e r c a b i n e t temperatures within the food zone range. (8). When the unit is turned on, the lamp will illuminate green to let the customer know that the Refrigerator is turned on and that the system has sufficient DC voltage to operate the Refrigerator . Lamp A-6-3. (9). It must be remembered that a DC wire hook- up to the terminal block is required for any Refrigerator to operate on 120 volts AC, 12 volts DC or LP gas.

9 (10). From the rear of our example we can see the shut-off valve and knob where the main LP. gas supply is connected to the Refrigerator , 12. volt DC terminal block where the 12 volt power source comes into the Refrigerator to operate the system and the LP gas solenoid valve which includes the 12 millimeter test plug where the LP gas pressure can be checked. (11). The solenoid valve replaces the user operated flame failure safety device that is found on the manually controlled Refrigerator models. (12). Finally, to the right of the solenoid valve is the orifice burner assembly which generates the heat required on the LP gas mode to operate the absorption cooling unit. A-6-4. (13). Just above the burner assembly, located in the generator section of the cooling unit, are the 12 volt DC and 120 volt AC heating elements that provide the heat to the cooling unit on those modes.

10 (14). By removing the two screws on the left side of the base assembly and one screw in the burner area, rotate the clamping plate clockwise to remove it. (15). The mounting plate assembly can then be moved backward to gain access to the re- maining parts in the control system. (16). From this view we can see the printed Circuit board which controls the automatic heat selection functions of the Refrigerator and the 12 volt DC relay which energizes the 12 volt DC heating element when the automatic selection calls for 12 volt operation. To the right of the DC relay is the igniter reigniter module. A-6-5. (17). This component replaces the piezo lighter that has been used on Dometic manually controlled refrigerators for several years. When the automatic controls select LP gas operation, 12 volts are sent to the igniter which produce a high voltage to create a pulsating spark at the burner.